<template>
  <div>
       <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 警告区域 -->
          <el-alert
             title="注意：只允许为第三级分类设置相关参数！"
             type="warning" :closable="false"
             show-icon>
          </el-alert>

          <!-- 选择商品分类区域 -->
          <el-row class="cat_opt">
              <el-col>
                  <span>选择商品分类：</span>
                  <!-- 选择商品分类的级联选择框 -->
                   <el-cascader
                       v-model="selectedCateKeys"
                       :options="catelist"
                       :props="cateProps"
                       @change="handleChange"></el-cascader>
               </el-col>
          </el-row>

          <!-- tab页签区域 -->
       <el-tabs v-model="activeName" @tab-click="handleTabClick">
         <!-- 添加动态参数的面板 -->
         <el-tab-pane label="动态参数" name="many">
           <!-- 添加参数的按钮 -->
           <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
           <!-- 动态参数表格 -->
           <el-table :data="manyTableData" border stripe>
             <!-- 展开行 -->
             <el-table-column type="expand">
               <template slot-scope="scope">
                 <!-- 循环渲染Tag标签 -->
                   <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i"
                    closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                 <!-- 输入的文本框 -->
                   <el-input
                   class="input-new-tag"
                   v-if="scope.row.inputVisible"
                   v-model="scope.row.inputValue"
                   ref="saveTagInput"
                   size="small"
                   @keyup.enter.native="handleInputConfirm(scope.row)"
                   @blur="handleInputConfirm(scope.row)">
                 </el-input>
                 <!-- 添加按钮 -->
                 <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
               </template>
             </el-table-column>
             <!-- 索引列 -->
             <el-table-column type="index"></el-table-column>
             <el-table-column label="参数名称" prop="attr_name"></el-table-column>
             <el-table-column label="操作">
               <template slot-scope="scope">
                 <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                 <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
               </template>
             </el-table-column>
           </el-table>
         </el-tab-pane>
         <!-- 添加静态属性的面板 -->
         <el-tab-pane label="静态属性" name="only">
           <!-- 添加属性的按钮 -->
           <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
           <!-- 静态属性表格 -->
           <el-table :data="onlyTableData" border stripe>
             <!-- 展开行 -->
             <el-table-column type="expand">
               <template slot-scope="scope">
                 <!-- 循环渲染Tag标签 -->
                   <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i"
                    closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                 <!-- 输入的文本框 -->
                   <el-input
                   class="input-new-tag"
                   v-if="scope.row.inputVisible"
                   v-model="scope.row.inputValue"
                   ref="saveTagInput"
                   size="small"
                   @keyup.enter.native="handleInputConfirm(scope.row)"
                   @blur="handleInputConfirm(scope.row)">
                 </el-input>
                 <!-- 添加按钮 -->
                 <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
               </template>
             </el-table-column>
             <!-- 索引列 -->
             <el-table-column type="index"></el-table-column>
             <el-table-column label="属性名称" prop="attr_name"></el-table-column>
             <el-table-column label="操作">
               <template slot-scope="scope">
                 <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                 <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
               </template>
             </el-table-column>
           </el-table>
         </el-tab-pane>
       </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
       :title="'添加' + titleText"
       :visible.sync="addDialogVisible"
       width="50%" @close="addDialogClosed">
       <!-- 添加参数的对话框 -->
       <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
         <el-form-item :label="titleText" prop="attr_name">
           <el-input v-model="addForm.attr_name"></el-input>
         </el-form-item>
       </el-form>
       <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
       :title="'修改' + titleText"
       :visible.sync="editDialogVisible"
       width="50%" @close="editDialogClosed">
       <!-- 添加参数的对话框 -->
       <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
         <el-form-item :label="titleText" prop="attr_name">
           <el-input v-model="editForm.attr_name"></el-input>
         </el-form-item>
       </el-form>
       <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children"
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签名称
      activeName: "many",
      // 动态参数的数据
      manyTableData: [],
      // 静态参数的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ""
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [{ required: true, message: "请输入参数名称", trigger: "blur" }]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改表单数据对象
      editForm: {},

      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [{ required: true, message: "请输入参数名称", trigger: "blur" }]
      }
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品列表失败！");
      }
      this.catelist = res.data;
      console.log(this.catelist);
    },
    // 级联选择框选中项变化，会触发这个函数
    handleChange() {
      this.getParamsData();
    },
    // tab页签点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName);
      this.getParamsData();
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }

      // 证明选中的是三级分类
      console.log(this.selectedCateKeys);
      // 根据所选分类的id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败！");
      }

      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        // 控制文本框的显示与隐藏
        item.inputVisible = false;
        // 文本框中输入的值
        item.inputValue = "";
      });
      console.log(res.data);
      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        );

        if (res.meta.status !== 201) {
          return this.$message.error("添加参数失败！");
        }

        this.$message.success("添加参数成功！");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog(attr_id) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName }
        }
      );

      if (res.meta.status !== 200) {
        return this.$$message.error("获取参数信息失败！");
      }
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    // 重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 点击按钮，修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        );

        if (res.meta.status !== 200) {
          return this.$message.error("修改参数失败！");
        }

        this.$message.success("修改参数成功！");
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },
    // 根据id删除对应的参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm("此操作将永久删除该参数, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning"
      }).catch(err => err);

      // 用户取消了删除的操作
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除！");
      }

      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );

      if (res.meta.status !== 200) {
        return this.$message.error("删除参数失败！");
      }
      this.$message.success("删除参数成功！");
      this.getParamsData();
    },
    // 文本框失去焦点，或按下回车键都会触发
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }

      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      this.saveAttrVals(row);
    },
    // 将对 attr_vals 的操作保存到数据库
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" ")
        }
      );

      if (res.meta.status !== 200) {
        return this.$message.error("修改参数项失败！");
      }
      this.$message.success("修改参数项成功！");
    },

    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true;
      // 让文本框自动获取焦点
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
      this.saveAttrVals(row);
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，赋值返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    // 当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态属性";
    }
  }
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>


